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參數(shù)資料
| 型號： | CS8121 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | 5V, 1A Linear Regulator with and ENABLE RESET |
| 中文描述： | 5V的，與第1A線性穩(wěn)壓器和啟用復位 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 205K |
| 代理商： | CS8121 |
If the input voltage rises above 30V (e.g. load dump), the
output shuts down. This response protects the internal cir-
cuitry and enables the IC to survive unexpected voltage
transients.
Using an emitter sense scheme, the amount of current
through the NPN pass transistor is monitored. Feedback
circuitry insures that the output current never exceeds a
preset limit.
Should the junction temperature of the power device
exceed 180C (typ) the power transistor is turned off.
Thermal shutdown is an effective means to prevent die
overheating since the power transistor is the principle
heat source in the IC.
The CS8121 contains two microprocessor compatible con-
trol functions:
and
ENABLE
(Figure 3).
Function
The
When the voltage on the
the output pass transistor turns off, leaving a high
impedance facing the load. The IC will remain in Sleep
mode, drawing only 250μA, until the voltage on the lead
drops below 2.1V typ. Hysteresis (800mV) is built into the
function to provide good noise immunity.
ENABLE
function switches the output transistor.
ENABLE
lead exceeds 2.9V typ,
Function
A
ers up (V
OUT
> V
OUT
- 100mV) or when V
OUT
drops out of
regulation (V
OUT
< V
OUT
- 140mV, typ). 40mV of hysteresis
is included in the function to minimize oscillations.
The
output is an open collector NPN transistor,
controlled by a low voltage detection circuit. The circuit is
functionally independent of the rest of the IC, thereby
guaranteeing that the RESET signal is valid for V
OUT
as
low as 1V.
An external RC network on the
vides a sufficiently long delay for most microprocessor
based applications. RC values can be chosen using the
following formula:
[
signal (low voltage) is generated as the IC pow-
lead (Figure 4) pro-
R
TOT
′
C
RST
where:
R
TOT
= R
RST
in parallel with R
IN
,
R
IN
= μP port impedance,
C
RST
=
t
Delay
= desired delay time,
V
RST
= V
SAT
of
V
T
= μP logic threshold voltage.
delay capacitor,
lead (0.7V @ turn - on), and
RESET
RESET
]
RESET
RESET
RESET
RESET
ENABLE
ENABLE
RESET
5
Regulator Control Functions
Figure 4. RC Network for
Delay
RESET
C
Circuit Description: continued
Dt
Delay
ln
)
V
T
D V
OUT
V
RST
D V
OUT
(
RESET
CS8121
V
OUT
C
RST
R
RST
10
m
F
tantalum
5V to
m
P
and
System
Power
to
m
P
RESET
Port
(1) = NO RESET DELAY CAPACITOR
(2) = WITH RESET DELAY CAPACITOR
FOR 7V < V
IN
< 26V
V
OUT
V
RT(ON)
ENABLE
V
RT(OFF)
(1)
(2)
V
IN
V
IN(HI)
HI
LO
VR
PEAK
VR
SAT
VR
PEAK
RESET
Figure 3. Circuit Waveforms for the CS8121
相關PDF資料 |
PDF描述 |
|---|---|
| CS8121YTVA5 | Multiconductor Cable; Number of Conductors:4; Conductor Size AWG:22; No. Strands x Strand Size:7 x 30; Jacket Material:Polypropylene; Number of Pairs:2; Features:Unshielded; Impedance:50ohm; Leaded Process Compatible:Yes RoHS Compliant: Yes |
| CS8121YTHA5 | Hook-Up Wire; Conductor Size AWG:20; No. Strands x Strand Size:10 x 30; Jacket Color:Black; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1015, CSA Type TEW, JQA-F-, Passes VW-1 Flame Test; Conductor Material:Copper RoHS Compliant: Yes |
| CS8121YTFVA5 | 5V, 1A Linear Regulator with and ENABLE RESET |
| CS8122YT5 | 2% 5V, 750mA Low Dropout Linear Regulator with Delayed RESET |
| CS8122 | 2% 5V, 750mA Low Dropout Linear Regulator with Delayed RESET |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CS-8121 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5V 1A Linear Regulator with Reset and Enable |
| CS8121/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5V， 1A Linear Regulator with RESETbar and ENABLEbar |
| CS-8121DP7 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| CS-8121T5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| CS-8121TF5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
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